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41 changes: 41 additions & 0 deletions .gitignore
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node_modules
dist
build
/Test*

# local env files
.env.local
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*.sln
*.sw?

__pycache__
~~*
--*
==*
package-lock.json
yarn.lock
.git
/*.zip
/*.py
/*.exe
/*.jar
/*.md
/*.json
/*.js
/*.txt
/.gitattributes
/.*ignore
/DBR-*
/sampleFromGithub
/src
/Web.config

!/dist
/dist/*
#!/dist/class
#!/dist/enum
#!/dist/interface
!/dist/dbr.js
!/dist/dbr.mjs
!/dist/dbr.browser.mjs
!/dist/dbr-*.worker.js
!/dist/dbr-*.wasm.js
!/dist/dbr-*.wasm
!/dist/dbr.d.ts
!/dist/dbr.reference.d.ts
!/dist/dbr.scanner.html
!/dist/dls.license.dialog.html
!/dist/README.md

!/README.md
!/README.NODE.md
!/package.json
!/LICENSE
5 changes: 5 additions & 0 deletions LICENSE
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For web:
https://www.dynamsoft.com/Products/barcode-reader-license-agreement.aspx#javascript?utm_source=github

For node:
https://www.dynamsoft.com/Products/barcode-reader-license-agreement.aspx?utm_source=github
176 changes: 176 additions & 0 deletions README.NODE.md
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# Dynamsoft JavaScript Barcode SDK for Node

> This library is the Node.js edition of Dynamsoft Barcode Reader. If you are looking to implement barcode reading feature in a web page, please check out the other library [Dynamsoft JavaScript Barcode SDK for Web](https://github.com/dynamsoft-dbr/javascript-barcode/?utm_source=github&package=js).

Both 1D and 2D barcode symbiology are supported including the popular `Code 39`, `EAN-13`, `QR`, `PDF417`, etc.+ Find the full list [here](https://www.dynamsoft.com/barcode-reader/overview/?utm_source=github&package=js).

The library is based on `webassembly` which has been an official feature of Node.js since `LTS 8`. If you are using Node.js LTS 8 and have no plan to upgrade it, check out [how to use the library in Node.js LTS 8](#how-to-use-the-library-in-nodejs-lts-8). That said, Node.js version >= LTS 12 is recommended because the library will try to use `worker_threads` when decoding.

> Also see [Dynamsoft JavaScript Barcode SDK for Web](https://github.com/Dynamsoft/javascript-barcode/blob/master/README.md).

## Get Started

* Check your Node.js version

```shell
> node -v
v12.13.1
```

* Installs the library from npm

```shell
> npm install dynamsoft-javascript-barcode --save
```
* Create a `js` file and include the library

```js
let DBR = require("dynamsoft-javascript-barcode");
```

The following also works
```js
let DBR = require("path/to/dist/dbr.js");
```

> **Note**
> The library uses `Promise` a lot, so it's recommended to write the related code in a `async` function so that later you can use `await`
>
> ```js
> (async()=>{
> // many work will done here
> })();
> ```

* Create an instance of the reader

```js
let reader = await DBR.BarcodeReader.createInstance();
```

* Decode a file by its path

```js
let results = await reader.decode('path/to/sample.png');
```

Or just decode a file by its URL

```js
let results = await reader.decode('https://demo.dynamsoft.com/barcode-reader/img/AllSupportedBarcodeTypes.png');
```
> **NOTE**
> The following image formats are supported by default: `png`, `jpg`, `bmp`, `gif`.
>
> If you want to decode other files like `pdf`'s, you need to convert them to images first. Contact [Dynamsoft Support](https://www.dynamsoft.com/company/contact/?utm_source=github&package=js) to find out more.
>
> If you want to decode raw image data (`RGBA`) from sources like a camera. You can use the API `deocdeBuffer`. Check out [C++ API decodeBuffer](https://www.dynamsoft.com/barcode-reader/programming/cplusplus/api-reference/cbarcodereader-methods/decode.html?ver=latest&utm_source=github&package=js#decodebuffer) for more details.

* Print out the results

```js
for(let result of results){
console.log(result.barcodeText);
}
```

* Run your code.

```shell
> node your-code.js
```

Last not but least, don't forget to set a `productKey`! If you don't have a key yet, click [here](https://www.dynamsoft.com/customer/license/trialLicense?product=dbr&package=js&utm_source=github) to get one.

```js
DBR.BarcodeReader.productKeys = 'PRODUCT-KEYS';
```

**Full code**

```js
let DBR = require('dynamsoft-node-barcode');
// Please visit https://www.dynamsoft.com/customer/license/trialLicense?product=dbr&package=js&utm_source=github to get a trial license
DBR.BarcodeReader.productKeys = 'PRODUCT-KEYS';

let pReader = null;
(async()=>{
let reader = await DBR.BarcodeReader.createInstance();
for(let result of await reader.decode('https://demo.dynamsoft.com/barcode-reader/img/AllSupportedBarcodeTypes.png')){
console.log(result.barcodeText);
}
reader.destroy();

// Since the worker keep alive, you can call
await DBR.BarcodeReader._dbrWorker.terminate();
// when you need to exit this process.
// Or call
process.exit();
// directly.
})();

```

## Change Decoding Settings

To set up the library for decoding, use the APIs `getRuntimeSettings` & `updateRuntimeSettings`.

```js
await barcodeScanner.updateRuntimeSettings("speed");
```
```js
await barcodeScanner.updateRuntimeSettings("balance");
```
```js
await barcodeScanner.updateRuntimeSettings("coverage");
```
```js
let settings = await reader.getRuntimeSettings();
settings.localizationModes = [
Dynamsoft.DBR.EnumLocalizationMode.LM_CONNECTED_BLOCKS,
Dynamsoft.DBR.EnumLocalizationMode.LM_SCAN_DIRECTLY,
Dynamsoft.DBR.EnumLocalizationMode.LM_LINES, 0, 0, 0, 0, 0];
settings.deblurLevel = 2;
await reader.updateRuntimeSettings(settings);
```

See [Barcode reading settings Guide](https://www.dynamsoft.com/barcode-reader/programming/cplusplus/user-guide.html?ver=latest#use-publicruntimesettings-struct-to-change-settings?utm_source=github&package=js) for basic usage.

See [C++ API RuntimeSettings](https://www.dynamsoft.com/barcode-reader/programming/c-cplusplus/struct/PublicRuntimeSettings.html?utm_source=github&package=js) for more details.

To find out which settings best suit your usage scenario, visit [DBR Main Online Demo](https://demo.dynamsoft.com/barcode-reader/?utm_source=github&package=js).

Any questions, please contact [Dynamsoft support](https://www.dynamsoft.com/company/contact/?utm_source=github&package=js).



## How to use the library in Node.js LTS 8

Node.js LTS 8 doesn't support `worker_threads`, so the decoding will happen in the same main thread which means it's a blocking operation. The following code snippets demonstrate the basic usage.

**Decode**

```js
var dbr = require('path/to/dist/dbr-<version>.node.wasm.js');
dbr.onRuntimeInitialized = ()=>{
dbr.BarcodeReaderWasm.init('{"productKeys":"PRODUCT-KEYS"}');
var reader = new dbr.BarcodeReaderWasm(false,-1);
var fs = require('fs');
var img = fs.readFileSync('./sample.png');
var resultsInfo = JSON.parse(reader.decodeFileInMemory(new Uint8Array(img)));
console.log(resultsInfo);
};
```

**Change settings**

```js
var settings = JSON.parse(reader.getRuntimeSettings());
settings.expectedBarcodesCount = 999;
reader.updateRuntimeSettings(JSON.stringify(settings));
```





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